I bet you that @lordmarcovan could answer that question. He has a die made up with his crest on it. I have a batch of his elongated coins and would assume that he had the die made up.
The US Mint has absolutely nothing to do with elongated cents.. It's a novelty item done by others after the coin is minted. Do you know how elongated coins are made?
I think they are rolled from a zinc penny but somebody needs to make a die right ? One side only I think.
These elongated cents are first struck as a US cent. Then elongated thru a rolling machine. These are not made with dies, nor are they struck one sided.
They are made with dies, roller dies with one roller having the design engraved in it and the other die is smooth and helps press the coin into the design roller. They used to use a similar process to actually make coins only with designs on both rollers. Not in the US Mint, at least not for production. The Mint did have a prototype roller press in testing at the Philadelphia Mint in 1969. Some of the colonial coins were struck on rocker or roller presses as well. A rocker press is similar but instead of the rollers going all the way around it reciprocated with the roller going back and forth.
All of the Massachusetts silver coinage, except the NE coinage and the small planchet Pine Tree shillings, were made on a rocker press. That's why most all of them are bent.
I did, and my custom dies were contracted through Cindy Calhoun, at elongatedpenny.net. I am pretty sure she herself then subcontracts the actual engraving to another professional.